Journal Article

FZJ-2020-04818

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png A microwave‐based one‐pot process for homogeneous surface coating: improved electrochemical performance of Li(Ni1/3Mn1/3Co1/3)O2 with a nano‐scaled ZnO:Al layer

Wolff, M. (Corresponding author)FZJ* ; Lobe, S.FZJ* ; Dellen, C.FZJ* ; Uhlenbruck, S.FZJ* ; Ribeiro, C. ; Guichard, X. H. ; Niederberger, M. ; Makvandi, A. ; Peterlechner, M. ; Wilde, G. ; Fattakhova‐Rohlfing, D. ; Guillon, O.FZJ*

2021
Wiley-VCH Weinheim, Germany

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Please use a persistent id in citations: http://hdl.handle.net/2128/26989  doi:10.1002/nano.202000079

Abstract: In this article, a versatile process based on microwave-assisted sol-gel synthesis is introduced in order to apply a surface coating on cathode material for lithium-ion batteries. Here, a nano-scaled ZnO:Al (AZO) layer is coated homogeneously onto Li(Ni1/3Mn1/3Co1/3)O2 (NMC111) powder at temperatures below 210 °C within a few minutes. In contrast to other wet-chemical coating techniques, the method described here is conducted in a one-pot reaction and does not require a post-annealing step at elevated temperatures. Investigations via high resolution transmission electron microscopy (HR-TEM), scanning transmission electron microscopy (STEM) and inductively-coupled plasma optical emission spectroscopy (ICP-OES) promote a thorough understanding of coating microstructure and quality in dependence of reaction temperature, duration and precursor concentration. The AZO protective coating on NMC111 significantly reduce capacity fading during cycling in the voltage range of 3.0 – 4.5 V. Furthermore, applying optimal quantities of the coating agent on NMC111 lead to enhanced specific capacities compared to the uncoated material.

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEK-1)
2. JARA-ENERGY (JARA-ENERGY)

Research Program(s):

1. 131 - Electrochemical Storage (POF3-131) (POF3-131)
2. 1221 - Fundamentals and Materials (POF4-122) (POF4-122)
3. 1122 - Design, Operation and Digitalization of the Future Energy Grids (POF4-112) (POF4-112)

Appears in the scientific report 2021

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